What good space related stuff for a 4 yo

Mini-g is learning about space at school and seems to be really really interested in it, much more than she has been in other subjects that they have covered. What good things can I take her too or get for her that will fuel this interest? I have a good book about it all by Usborne, and I am planning a trip to the Science Museum (we are in London)but wondered if anyone else has some good ideas. Assuming this is in the national curriculum there should be a few of you with kids learning the same stuff, what have they enjoyed?

Get the Planets iPhone app if you have one - then sit in the dark with her and point out the stars, planets etc. That's what I did with my two when they got interested in it after a school project (same age).

Look up the ISS on the internet, especially Chris Hadfield, let them get into the WOW of it all, then pop outside and see it passing overhead, having sneakily checked the time and direction in advance.

Surprisingly, never been to the place in Leicester, but that'd be my recommendation.
Science Museum is always an ace place (far too much stuff there).
Heaven's Above and ISS spotting (as above) is always fun for all ages.
Google Sky View on the phone (at least on Android, but I assume iphone too?)